Pin-key assembly

Abstract

A tapered pin-key for securing a part and a shaft where the part has a cylindrical bore for receiving the shaft and a keyway tangentially intersecting the bore, and the shaft has a tangential groove shallower than the depth of the intersection of the keyway and the bore. The pin-key comprises two cylindrical surfaces converging at a small angle. The radius of the two cylindrical surfaces, the keyway, and the groove in the shaft, are all equal. The pin-key is placed in the keyway with one face engaging the surface of the keyway and the second face engaging the surface of the groove in the shaft, thereby securing the part and the shaft against relative rotational or axial movement.

I claim: 
     
       1. A pin-key assembly for mounting a shaft to a part to lock the shaft against both axial and torsional movement relative to the part, said assembly comprising: a shaft;   a part bored to fit the shaft and mounted thereon;   a cylindrical keyway in the part tangentially intersecting the bore;   a tangential cylindrical groove in the shaft shallower than the intersection of the keyway and bore;   a tangential tapered pin-key having a first cylindrical face and a second cylindrical face that converge toward the bottom of the pin-key, the pin-key mounted in the keyway with the first cylindrical face engaging the surface of the cylindrical keyway and the second cylindrical face engaging the surface of the cylindrical groove in the shaft, the radius of the first cylindrical face of the pin-key being equal to the radius of the cylindrical keyway, and the radius of the second cylindrical face of the pin-key being equal to the radius of the cylindrical groove.   
     
     
       2. The assembly of claim 1 wherein the first and second faces converge at an angle of about between 1° and 11°. 
     
     
       3. The assembly of claim 2 wherein the first and second faces converge at an angle of about 8.5°. 
     
     
       4. The assembly of claim 2 wherein the first and second faces converge at an angle of about 4°. 
     
     
       5. The assembly of claim 1 further comprising an externally threaded stud protruding from the bottom of the pin-key. 
     
     
       6. The assembly of claim 1 further comprising means defining a threaded hole in the top of the pin-key. 
     
     
       7. The combination of claim 1 wherein the cylindrical faces of the pin-key intersect along opposite sides of the pin-key. 
     
     
       8. A pin-key assembly for mounting a shaft to a part to lock the shaft against both axial and torsional movement relative to the part, said assembly comprising: a shaft;   a part bored to fit the shaft and mounted thereon;   a cylindrical keyway in the part tangentially intersecting the bore;   a tangential cylindrical groove in the shaft shallower than the intersection of the keyway and bore;   the radius of the cylindrical keyway being equal to the radius of the cylindrical groove;   a tangential tapered pin-key having a first cylindrical face and a second cylindrical face that converge toward the bottom of the pin-key, the first and second cylindrical faces having equal radii, and the cylindrical faces having radii equal to the radii of the cylindrical keyway and the cylindrical groove;   the pin-key mounted in the keyway with the first cylindrical face engaging the surface of the cylindrical keyway and the second cylindrical face engaging the surface of the cylindrical groove in the shaft, the radius of the first cylindrical face of the pin-key being equal to the radius of the cylindrical keyway, and the radius of the second cylindrical face of the pin-key being equal to the radius of the cylindrical groove.   
     
     
       9. The assembly of claim 8 wherein the first and second faces converge at an angle of about between 1° and 11°. 
     
     
       10. The assembly of claim 9 wherein the first and second faces converge at an angle of about 8.5°. 
     
     
       11. The assembly of claim 9 wherein the first and second faces converge at an angle of about 4°. 
     
     
       12. The assembly of claim 8 further comprising an externally threaded stud protruding from the bottom of the pin-key. 
     
     
       13. The assembly of claim 8 further comprising means defining a threaded hole in the top of the pin-key. 
     
     
       14. The assembly of claim 8 wherein the top and bottom are perpendicular to the first face. 
     
     
       15. The structure of claim 8 wherein the cylindrical faces of the pin-key intersect along opposite sides of the pin-key.